Mason Greenwood has been arrested on suspicion of rape and assault after a woman alleging incidents of violence posted pictures and videos on social media.
Greenwood, 20, remains in custody for questioning and enquiries are ongoing, Greater Manchester Police said.
The force launched an investigation after being made aware of the images and footage earlier on Sunday.
It comes after Manchester United announced that Greenwood would not return to training or play any matches “until further notice” after he was accused of assaulting a woman.